Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd1b2a8c688f0ee…

MALICIOUS

PDF

86.9 KB Created: 2021-07-20 04:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 73100140b4752b524fa6f3b9cf423299 SHA-1: d3ed3f1e2baa49dcbb5743c65f79e602ccb1fc80 SHA-256: afd1b2a8c688f0ee8f88068f8a362f0bb130c0f6dc62ebc816c390c899939e6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF. The primary function appears to be redirecting users to potentially malicious content via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f5a377e40932947f2b9333fd6cb217ae/76847809983.pdf In PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/dd80a98d59429577bc0c0a426052e687/gojezi.pdfIn PDF document text
    • http://techhssilverbuffs.com/clients/61416/File/datovokuvabuxakato.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/14303509515.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/fenojagubar.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/11404733819.pdfIn PDF document text
    • https://uangraja.com/contents//files/22453241397.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/taleg.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/afa5b9ef60801a957d59665dca03b39b/47414152187.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1a8698848b95bbc3d9903a046cdfa4eb/50181903789.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/pobili.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/51904398586.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/56595891525.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ef3099d2---vapubugilikorisek.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608729cd6f3fd---74251868053.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089881ec6b4b---fowolonarezanifev.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/uqb5bv98tj212o0fr0l2vpe2vv/fugagad.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec67e66749---76156139076.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/falemesufapuraduxudom.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/98ebe3265ca03c87a1039eb868d1635f/zilagukekagudapubijija.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/duronitifomod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=leaf+shading+with+pencilPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFD 10720 bytes
SHA-256: bfda131a1db08f81d62b37094ed2ffa3694b236494877f00b39942780a4e4ef0
font_02_sfnt_off0001235b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235B 16740 bytes
SHA-256: 499f2a42757fe7deb31d583c840f754495e9c5208a0c2a7fe7577434c9c0c305

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